Sallen-Key Low-Pass Unity-Gain Filter Response

circuit diagram

frequency response

step response and poles

damping factor ζ

0.4

This Demonstration shows how various characteristics of a unity-gain low-pass Sallen–Key filter depends on its damping factor

ζ

. The characteristics considered are: transfer function poles, frequency response, and unit step response. The filter's frequency response was scaled (normalized) to have

ω

0

=1

. Frequency and magnitude denormalization are necessary in order to obtain practical values of circuit components.